crypto/asn1/asn1_lib.c

   1 /* crypto/asn1/asn1_lib.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include "cryptlib.h"
  61 #include <openssl/asn1.h>
  62 #include <openssl/asn1_mac.h>
  63
  64 static int asn1_get_length(unsigned char **pp,int *inf,long *rl,int max);
  65 static void asn1_put_length(unsigned char **pp, int length);
  66 const char *ASN1_version="ASN.1" OPENSSL_VERSION_PTEXT;
  67
  68 int ASN1_check_infinite_end(unsigned char **p, long len)
  69         {
  70         /* If there is 0 or 1 byte left, the length check should pick
  71          * things up */
  72         if (len <= 0)
  73                 return(1);
  74         else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0))
  75                 {
  76                 (*p)+=2;
  77                 return(1);
  78                 }
  79         return(0);
  80         }
  81
  82
  83 int ASN1_get_object(unsigned char **pp, long *plength, int *ptag, int *pclass,
  84              long omax)
  85         {
  86         int i,ret;
  87         long l;
  88         unsigned char *p= *pp;
  89         int tag,xclass,inf;
  90         long max=omax;
  91
  92         if (!max) goto err;
  93         ret=(*p&V_ASN1_CONSTRUCTED);
  94         xclass=(*p&V_ASN1_PRIVATE);
  95         i= *p&V_ASN1_PRIMITIVE_TAG;
  96         if (i == V_ASN1_PRIMITIVE_TAG)
  97                 {               /* high-tag */
  98                 p++;
  99                 if (--max == 0) goto err;
 100                 l=0;
 101                 while (*p&0x80)
 102                         {
 103                         l<<=7L;
 104                         l|= *(p++)&0x7f;
 105                         if (--max == 0) goto err;
 106                         }
 107                 l<<=7L;
 108                 l|= *(p++)&0x7f;
 109                 tag=(int)l;
 110                 }
 111         else
 112                 {
 113                 tag=i;
 114                 p++;
 115                 if (--max == 0) goto err;
 116                 }
 117         *ptag=tag;
 118         *pclass=xclass;
 119         if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err;
 120
 121 #if 0
 122         fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d  (%d > %d)\n",
 123                 (int)p,*plength,omax,(int)*pp,(int)(p+ *plength),
 124                 (int)(omax+ *pp));
 125
 126 #endif
 127         if (*plength > (omax - (*pp - p)))
 128                 {
 129                 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG);
 130                 /* Set this so that even if things are not long enough
 131                  * the values are set correctly */
 132                 ret|=0x80;
 133                 }
 134         *pp=p;
 135         return(ret|inf);
 136 err:
 137         ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG);
 138         return(0x80);
 139         }
 140
 141 static int asn1_get_length(unsigned char **pp, int *inf, long *rl, int max)
 142         {
 143         unsigned char *p= *pp;
 144         long ret=0;
 145         int i;
 146
 147         if (max-- < 1) return(0);
 148         if (*p == 0x80)
 149                 {
 150                 *inf=1;
 151                 ret=0;
 152                 p++;
 153                 }
 154         else
 155                 {
 156                 *inf=0;
 157                 i= *p&0x7f;
 158                 if (*(p++) & 0x80)
 159                         {
 160                         if (i > sizeof(long))
 161                                 return 0;
 162                         if (max-- == 0) return(0);
 163                         while (i-- > 0)
 164                                 {
 165                                 ret<<=8L;
 166                                 ret|= *(p++);
 167                                 if (max-- == 0) return(0);
 168                                 }
 169                         }
 170                 else
 171                         ret=i;
 172                 }
 173         if (ret < 0)
 174                 return 0;
 175         *pp=p;
 176         *rl=ret;
 177         return(1);
 178         }
 179
 180 /* class 0 is constructed
 181  * constructed == 2 for indefinite length constructed */
 182 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
 183              int xclass)
 184         {
 185         unsigned char *p= *pp;
 186         int i, ttag;
 187
 188         i=(constructed)?V_ASN1_CONSTRUCTED:0;
 189         i|=(xclass&V_ASN1_PRIVATE);
 190         if (tag < 31)
 191                 *(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG);
 192         else
 193                 {
 194                 *(p++)=i|V_ASN1_PRIMITIVE_TAG;
 195                 for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7;
 196                 ttag = i;
 197                 while(i-- > 0)
 198                         {
 199                         p[i] = tag & 0x7f;
 200                         if(i != (ttag - 1)) p[i] |= 0x80;
 201                         tag >>= 7;
 202                         }
 203                 p += ttag;
 204                 }
 205         if ((constructed == 2) && (length == 0))
 206                 *(p++)=0x80; /* der_put_length would output 0 instead */
 207         else
 208                 asn1_put_length(&p,length);
 209         *pp=p;
 210         }
 211
 212 static void asn1_put_length(unsigned char **pp, int length)
 213         {
 214         unsigned char *p= *pp;
 215         int i,l;
 216         if (length <= 127)
 217                 *(p++)=(unsigned char)length;
 218         else
 219                 {
 220                 l=length;
 221                 for (i=0; l > 0; i++)
 222                         l>>=8;
 223                 *(p++)=i|0x80;
 224                 l=i;
 225                 while (i-- > 0)
 226                         {
 227                         p[i]=length&0xff;
 228                         length>>=8;
 229                         }
 230                 p+=l;
 231                 }
 232         *pp=p;
 233         }
 234
 235 int ASN1_object_size(int constructed, int length, int tag)
 236         {
 237         int ret;
 238
 239         ret=length;
 240         ret++;
 241         if (tag >= 31)
 242                 {
 243                 while (tag > 0)
 244                         {
 245                         tag>>=7;
 246                         ret++;
 247                         }
 248                 }
 249         if ((length == 0) && (constructed == 2))
 250                 ret+=2;
 251         ret++;
 252         if (length > 127)
 253                 {
 254                 while (length > 0)
 255                         {
 256                         length>>=8;
 257                         ret++;
 258                         }
 259                 }
 260         return(ret);
 261         }
 262
 263 int asn1_Finish(ASN1_CTX *c)
 264         {
 265         if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
 266                 {
 267                 if (!ASN1_check_infinite_end(&c->p,c->slen))
 268                         {
 269                         c->error=ERR_R_MISSING_ASN1_EOS;
 270                         return(0);
 271                         }
 272                 }
 273         if (    ((c->slen != 0) && !(c->inf & 1)) ||
 274                 ((c->slen < 0) && (c->inf & 1)))
 275                 {
 276                 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
 277                 return(0);
 278                 }
 279         return(1);
 280         }
 281
 282 int asn1_GetSequence(ASN1_CTX *c, long *length)
 283         {
 284         unsigned char *q;
 285
 286         q=c->p;
 287         c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
 288                 *length);
 289         if (c->inf & 0x80)
 290                 {
 291                 c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL;
 292                 return(0);
 293                 }
 294         if (c->tag != V_ASN1_SEQUENCE)
 295                 {
 296                 c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
 297                 return(0);
 298                 }
 299         (*length)-=(c->p-q);
 300         if (c->max && (*length < 0))
 301                 {
 302                 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
 303                 return(0);
 304                 }
 305         if (c->inf == (1|V_ASN1_CONSTRUCTED))
 306                 c->slen= *length+ *(c->pp)-c->p;
 307         c->eos=0;
 308         return(1);
 309         }
 310
 311 ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str)
 312         {
 313         ASN1_STRING *ret;
 314
 315         if (str == NULL) return(NULL);
 316         if ((ret=ASN1_STRING_type_new(str->type)) == NULL)
 317                 return(NULL);
 318         if (!ASN1_STRING_set(ret,str->data,str->length))
 319                 {
 320                 ASN1_STRING_free(ret);
 321                 return(NULL);
 322                 }
 323         ret->flags = str->flags;
 324         return(ret);
 325         }
 326
 327 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
 328         {
 329         unsigned char *c;
 330         const char *data=_data;
 331
 332         if (len < 0)
 333                 {
 334                 if (data == NULL)
 335                         return(0);
 336                 else
 337                         len=strlen(data);
 338                 }
 339         if ((str->length < len) || (str->data == NULL))
 340                 {
 341                 c=str->data;
 342                 if (c == NULL)
 343                         str->data=OPENSSL_malloc(len+1);
 344                 else
 345                         str->data=OPENSSL_realloc(c,len+1);
 346
 347                 if (str->data == NULL)
 348                         {
 349                         str->data=c;
 350                         return(0);
 351                         }
 352                 }
 353         str->length=len;
 354         if (data != NULL)
 355                 {
 356                 memcpy(str->data,data,len);
 357                 /* an allowance for strings :-) */
 358                 str->data[len]='\0';
 359                 }
 360         return(1);
 361         }
 362
 363 ASN1_STRING *ASN1_STRING_new(void)
 364         {
 365         return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
 366         }
 367
 368
 369 ASN1_STRING *ASN1_STRING_type_new(int type)
 370         {
 371         ASN1_STRING *ret;
 372
 373         ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
 374         if (ret == NULL)
 375                 {
 376                 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE);
 377                 return(NULL);
 378                 }
 379         ret->length=0;
 380         ret->type=type;
 381         ret->data=NULL;
 382         ret->flags=0;
 383         return(ret);
 384         }
 385
 386 void ASN1_STRING_free(ASN1_STRING *a)
 387         {
 388         if (a == NULL) return;
 389         if (a->data != NULL) OPENSSL_free(a->data);
 390         OPENSSL_free(a);
 391         }
 392
 393 int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b)
 394         {
 395         int i;
 396
 397         i=(a->length-b->length);
 398         if (i == 0)
 399                 {
 400                 i=memcmp(a->data,b->data,a->length);
 401                 if (i == 0)
 402                         return(a->type-b->type);
 403                 else
 404                         return(i);
 405                 }
 406         else
 407                 return(i);
 408         }
 409
 410 void asn1_add_error(unsigned char *address, int offset)
 411         {
 412         char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1];
 413
 414         sprintf(buf1,"%lu",(unsigned long)address);
 415         sprintf(buf2,"%d",offset);
 416         ERR_add_error_data(4,"address=",buf1," offset=",buf2);
 417         }
 418
 419 int ASN1_STRING_length(ASN1_STRING *x)
 420 { return M_ASN1_STRING_length(x); }
 421
 422 void ASN1_STRING_length_set(ASN1_STRING *x, int len)
 423 { M_ASN1_STRING_length_set(x, len); return; }
 424
 425 int ASN1_STRING_type(ASN1_STRING *x)
 426 { return M_ASN1_STRING_type(x); }
 427
 428 unsigned char * ASN1_STRING_data(ASN1_STRING *x)
 429 { return M_ASN1_STRING_data(x); }